Celik was a free agent after leaving GAIS and becomes Ally McCoist's first signing of the January transfer window. Compensation would be due to the player's former club GAIS.

Despite a lack of recent competitive matches, Celik insists he is ready to be thrown into the action when called upon by McCoist.

He said: "I am always ready. I feel fit and able to be involved. I will show the fans but I can tell them that I am a player who always plays with heart.

"It doesn't matter to me where I play, that is for the coaches to decide. Of course the fans can expect to see goals but I can also defend well.''

Rangers are also set to make an offer to Estonian defender Enar Jaager, while fellow trialist Jorge Claros could extend his trial by another week. Meanwhile, McCoist says he is unaware of a bid from West Ham for striker Nikica Jelavic and claims the reported figure of £6million would not meet Rangers' valuation.

He said: "They have not made an official bid. The reported amount would not be enough to meet the demands of the owner - £6million is not nearly enough.''